XFF
A Go middleware for parsing X-Forwarded-For and Forwarded headers to correctly identify client IP addresses behind proxies.
What is XFF?
XFF is a Go middleware package that parses X-Forwarded-For and Forwarded HTTP headers to extract the original client IP address from requests that pass through proxies or load balancers. It solves the problem of web applications seeing proxy IPs instead of real client addresses, which is critical for accurate logging, security enforcement, and access control.
Go developers building web applications or APIs behind reverse proxies, load balancers, or CDNs who need reliable client IP detection.
Developers choose XFF because it's a lightweight, standards-compliant middleware that integrates seamlessly with Go's net/http package, providing a simple and reliable solution for a common infrastructure problem without adding unnecessary dependencies.
Overview
A Golang Middleware to handle X-Forwarded-For Header
Use Cases
Best For
- Extracting real client IPs in Go applications behind cloud load balancers
- Implementing IP-based rate limiting or access control in proxy environments
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